challenges in testing iec61850 ver 3

Testing Challenges : IEC61850

Jun Verzosa, Nestor Casilla, Jay Gosalia

Doble Engineering Company

Presentation topics

Introduction

What is IEC61850

Differences from Traditional sub station

Advantages

Architecture and Data Structure

Testing Simple distribution bus protection

Conclusion

2

What is IEC 61850 ?

Basic Concept : IEC61850

Inter OperabilityInter Operability

Core Idea IEC 61850

The core idea is a description language, that completely describes the data structure and functionality of a substation information system in a standardized manner.

The core idea is a description language, that completely describes the data structure and functionality of a substation information system in a standardized manner.

What Is IEC 61850?

International Standard

More than a Protocol

Substation AutomationBorrowed from Siemens

SubstationLAN Network

HMI

Muti Vendor Inter- Operability

Standardized language understood by devices of different manufacturers: key goal of IEC 61850

IEC 61850

Borrowed from Siemens

Conventional Sub - StationControl Centre Station HMI

Relay X1

RTU

Conventional Switchgear

ConventionalCT / VT's

Relay X2

Relay X1

Conventional Switchgear

Relay X2

ConventionalCT / VT's

Interlocking logic

Hardwired with parallel Copper wires

IEC 61850 Comm. Architecture

Control Center

Gateway

Relay X1

Bay Controller

Intelligent Switchgear

Non conventional

CT/VT

Relay X2

Relay X1

Bay Controller


Relay X2

Non conventional

CT/VT

Station HMI

Ethernet communication:Elimination of wiresAccess to informationOptimized functionality

Station Ethernet Bus

Process Bus

IEC 61850 Comm. Architecture

Control Center

Gateway

Relay X1

Bay Controller


Non conventional

CT/VT

Relay X2

Relay X1

Bay Controller


Relay X2

Non conventional

CT/VT

Station HMI

Station Ethernet Bus

Process Bus

Changes to IEC61850 sub station

Copper wiring is replaced by Ethernet cable

Ethernet switches connects different IEDs

GOOSE messages are equivalent to interconnect wires

Typically a bit position indicates the status of IED : 0 = Off, 1= On

11

What Is IEC 61850?

IEC 61850 is more than a protocol, it’s an architecture

Pro

cess

L

evel

Bay

L

evel

Sta

tio

n

Lev

el HMI

Station Bus

Process Bus


What Is IEC 61850?

Pro

cess

L

evel

Bay

L

evel

Sta

tio

n

Lev

el HMI

Station Bus

Process Bus (sampled analog values)


Conventional CTs and VTs with hard wiring are used today

Advantages of IEC61850

No copper interconnection

Reduced set up and configuration

No transducers and SCADA interface

Interoperability

Reduced manual efforts and errors

More capability and flexibility

Features of IEC61850

Self describing devices

Standardized devices & Object model

Standardized configuration language

Modern networking technology

Object naming

Publisher & Subscriber

16

21

3*V,3*I

52b

CR

Breaker Trip

BFI50BF

79ARI

86BF

Trip Relay

52b

Breaker Close

Bus Breaker Trip

Relay 21 subscribes to 52b and Carrier Received Relay 21 publishes Breaker Trip, BFI, ARI

Relay 50BF subscribes BFI from 21 Relay 79 publishes Breaker Close Relay 79 subscribes to ARI form 21.

IEC61850 : Device Definition

17

CB1

IED1

PTOC

RREC

XCBR

XSWI

MMXU

MMTR Metering

CSWI

CSWI

Measurement Unit

Disconnect Switch

Indication & Control

Circuit Breaker

Indication & Control

Auto Reclosing

Time Over Current

Accessing Data : Windows Explorer

PTOC (Time Over Current LN )RREC (Autorecloser LN )XCBR (Switchgear – Circuit Breaker)CSWI (Control - Circuit Breaker)XSWI (Switchgear – Disconnect)CSWI (Control - Disconnect)MMXU (Measurement Unit)MMTR (Metering)

+

+

+

+

+

+

IED1 IED1

+

+


IED1/XCBR

Accessing Data : Tree view

Mode (Mode)Beh (Behavior )Health (Health)Name (Name plate)Loc (Local operation)EEHealth (External equipment)EEName(External equipment name plate)OperCnt (Operation counter)Pos (Switch position)BlkOpen (Block opening)BlkClos (Block closing)ChMotEna (Charger motor enabled)CBOpCap (Circuit breaker operating capability)POWCap (Point On Wave switching capability)

+

+

+

+

+

+

+

+

+

+

+

+

+

+

XCBR

PTOCRREC

+

+

-

IED1/XCBRIED1


IED1/XCBR.Pos

Accessing Data : Tree view

Mode (Mode)Beh (Behavior )Health (Health)Name (Name plate)Loc (Local operation)EEHealth (External equipment)EEName(External equipment name plate)OperCnt (Operation counter)Pos (Switch position)

+

+

+

+

+

+

+

+

-

XCBR

PTOCRREC

+

+

-

ctlValstValpulseConfigoperTimq…more

intermediate-state (0)off (1)on (2)bad-state (3)

IED1/XCBR.PosIED1


IED1/XCBR.Pos.stVal

IEC61850 Data Communication

DN

P 3

.0

(to

EM

S/S

CA

DA

IED 1 Data“67 TOC Pick-up”

“CB1 is Closed”

“I Phase A is 200A”

“V Phase A is 26.3kV”

IED1/PTOC.Start.general IED1/XCBR.Pos.stVal

IED1/MMXU.A.phsA.mag

IED1/MMXU.V.phsA.mag

61850 Messages

HMI LinkageCB pos = IED1/XCBR.Pos.stVal

67 TOC PU = IED1/PTOC.Start.general

Ia = IED1/MMXU.A.phsA.mag

Va = IED1/MMXU.V.phsA.mag

CB1

IED1


• L System LN (2)• P Protection (28)• R Protection related (10)• C Control (5)• G Generic (3)• I Interfacing and archiving (4)• A Automatic control (4)

• M Metering and measurement (8)• S Sensor and monitoring (4)• X Switchgear (2)• T Instrument transformers (2)• Y Power transformers (4)• Z Further power system

equipment (15)

• Examples: Logical node classes• PTOC: Time overcurrent prot.• PDIF: Differential protection• RBRF: Breaker failure• XCBR: Circuit breaker

• GGIO: Generic logical node• CSWI: Switch controller• MMXU: Measurement unit• YPTR: Power transformer

Logical node groups

Logical Nodes

23

BayA1/Q0XCBR1.Pos.ctlVal

Local Device Name (free)

Logical Node Name Prefix (free)

Data Object Name (fixed)

Attribute Name (fixed)

Logical Node Class (fixed)

Logical Node Name Suffix (free)

Addressing a Data item

Simple Bus Protection

25

Feeder A Feeder B Feeder C

Incomer X

Block Trip

PTOC PU

Trip

Trip


26


Incomer X

Block Trip

PTOC PU

Trip

Trip


27


Incomer X

Block Trip

PTOC PU

Trip

Trip

Testing : Traditional Way

• Test individual relay and its performance• Test overall scheme• Test operating time, scheme logic etc.• Monitor inputs & outputs during testing• Relay output : To test instrument’s input to

record relay response• Test instruments outputs : To Relay input

to simulate system events

28

Test Relay Feeder A

29

Communication

Current TripOutput

Gen. Start

Test Feeder A

30

Test Relay Incomer

31

Communication

Current

Trip output

BlockTrip

Test Incomer : Feeder Fault

32

Incomer Test : Timers &Outputs

33

Incomer Test : Bus Fault

34

IEC61850 Testing

35

List the publishing and subscription messages ≡ Input and outputs

Assign publishing messages to inputs of F6150 : GN1..GN99

Assign subscription messages to output of F6150 : GP1..GP99

Use the same test plan as if testing the traditional way

GOOSE Message

36

GOOSE

37

GOOSE Messages

38

GOOSE Mapping : Inputs

39

Final Step : Save and Send

40

Testing : IEC61850

Same test plan can be used : GN instead of LN

Map inputs & outputs to GOOSE

Inputs & Outputs : GOOSE msg. on Ethernet

GOOSE acts as traditional inputs and outputs

41

Protection Testing Feeder A

42


Incomer X

Trip

Trip

BCU

BCU

• Apply current to feeder A and test set starts the timer• PTOC will starts and sends GOOSE message to Incomer to block trip.• When PTOC element trips, it will send GOOSE message & BCU will trip Feeder A• Test set stops the timer when GOOSE message from PTOC trip is received

Protection Testing Incomer X

43


Incomer X

Trip

Trip

BCU

BCU

• Apply current to Incomer X protection and test set starts the timer• PTOC will starts and wait for the GOOSE message from one of the feeder• After a short time delay if GOOSE message from the feeder is not received,

Incomer X protection will send a GOOSE trip message to trip breaker• Test set stops the timer to time the overall trip time

Protection Suite : IEC61850

44

Messages

• Define GOOSE messages• Discover, import SCL

Dataset

• Select dataset item for testing• Assign to F6 Inputs and outputs

Configure

• Download data items and I/O mapping to F6150

Protection Suite : IEC61850

45

Select GOOSE messages & Dataset items

Discover Messages or Import SCL or enter manually in GSE

GOOSE Testing : GN and GP

46

Testing IEC61850 IEDs using F6150

Step 1. “Discover” or “Import” GOOSE Messages, select data items for use as inputs and outputs; or Open the relevant Saved CFG file


Incomer X

Trip

Trip

BCU

BCU

Testing IEC61850 IEDs using F6150Step 2. Connect F6150 (if not yet connected)

Step 3. Configure F6150 for GOOSE I/O messages of Download CFG

Step 4. Perform Tests


Incomer X

Trip

Trip

BCU

BCU

Testing Comparisons

Traditional testing

Protection response is recorded via its contacts connected to test

instruments LN1..LN8

Test instrument’s programmable outputs simulates the event :via

LP1..LP8

IEC61850 Testing

Test instruments Senses input by published GOOSE messages

via GN1..GN99

Test instruments can simulate output by publishing GOOSE

message via GP1..GP99

Existing test plan can be used with change in sense conditions

Like LN1 to GN1

IEC61850 : Troubleshooting

Connect the laptop to the network, start the software & monitor just about anything & everything

Safer then trouble shooting live circuit with meter and probes

Can be done remotely

Wiring change done by programming change

Change configuration by programming change

50

Challenges : IEC61850

Modifications

Documentation

Relay functions

Network knowledge

Learning Curve

•Done by its CID file•Need to reload new CID file

•Use the correct CID file•Archive the modified CID file

•Retest after modification•As we do it after a wiring mod

•Understanding of the network•Not needed for tradition testing

•Trouble shooting is restricted if one cannot log on

•Understanding new ways of testing

51

Summary

IEC61850 brings advantages and challenges

Continuous supervision of the system

Economical installations : no copper wires

Easier modifications : changes via PC

Remote monitoring : Complex but powerful

Test engineer need to learn new way of testing

PC familiarity is a must

52

Any Questions?

53